My first interaction with LLMs for programming was asking ChatGPT about one of our interview questions: sending a request in tcp, sending an udp packet, and an icmp request. It confidently wrote code using TcpSocket (correct), UdpSocket (correct) and IcmpSocket (hallucination). Further attempts to tell it that it was incorrect ended up with more and more incorrect code. Guess that Rust is not common enough for it to know it well.